[Bug bootstrap/56689] internal compiler error: in get_loop_body, at cfgloop.c:841
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56689 Andreas Krebbel krebbel at gcc dot gnu.org changed: What|Removed |Added Attachment #29707|0 |1 is obsolete|| --- Comment #3 from Andreas Krebbel krebbel at gcc dot gnu.org 2013-03-25 08:01:00 UTC --- Created attachment 29717 -- http://gcc.gnu.org/bugzilla/attachment.cgi?id=29717 Manually reduced testcase cc1 -O2 t.c t.c: In function ‘fix_register’: t.c:6:1: error: size of loop 1 should be 7, not 8 fix_register (const char *name, int fixed, int call_used, int nregs) ^ t.c:6:1: internal compiler error: in verify_loop_structure, at cfgloop.c:1640 0x80227273 verify_loop_structure() /home/andreas/clean/gcc-head/gcc/cfgloop.c:1640 0x8076488f perform_tree_ssa_dce /home/andreas/clean/gcc-head/gcc/tree-ssa-dce.c:1554 0x80764be1 tree_ssa_cd_dce /home/andreas/clean/gcc-head/gcc/tree-ssa-dce.c:1637 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See http://gcc.gnu.org/bugs.html for instructions.
[Bug bootstrap/56689] internal compiler error: in get_loop_body, at cfgloop.c:841
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56689 --- Comment #4 from Andreas Krebbel krebbel at gcc dot gnu.org 2013-03-25 09:14:52 UTC --- phicprop2: bb 9: switch (fixed_11(D)) default: L15, case 0: L6, case 1: L12 vrp2: bb 9: switch (fixed_13(D)) default: L15, case 1: L12 L6: (bb 10) switch (call_used_12(D)) default: L8, case 1: L7 VRP optimizes the case 0: L6 away. So there is no edge between bb9 and bb10 anymore. Due to that dfs_enumerate_from does not consider bb9 to be part of the loop anymore. It counts 7 instead of 8 bbs for the loop due to this.
[Bug bootstrap/56689] internal compiler error: in get_loop_body, at cfgloop.c:841
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56689 Richard Biener rguenth at gcc dot gnu.org changed: What|Removed |Added CC||rguenth at gcc dot gnu.org --- Comment #1 from Richard Biener rguenth at gcc dot gnu.org 2013-03-22 13:13:55 UTC --- Please attach preprocessed source so I can reproduce with a cross.
[Bug bootstrap/56689] internal compiler error: in get_loop_body, at cfgloop.c:841
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56689 --- Comment #2 from Andreas Krebbel krebbel at gcc dot gnu.org 2013-03-22 14:56:43 UTC --- Created attachment 29707 -- http://gcc.gnu.org/bugzilla/attachment.cgi?id=29707 Reduced testcase cc1plus -fpreprocessed -quiet -O2 t.cc t.cc: In function ‘void fix_register(const char*, int, int)’: t.cc:33:1: error: size of loop 1 should be 7, not 8 fix_register (const char *name, int fixed, int call_used) ^ t.cc:33:1: internal compiler error: in verify_loop_structure, at cfgloop.c:1640 0x8054a083 verify_loop_structure() /home/andreas/clean/gcc-head/gcc/cfgloop.c:1640 0x808a8b43 loop_optimizer_init(unsigned int) /home/andreas/clean/gcc-head/gcc/loop-init.c:100 0x80c0ddfd perform_tree_ssa_dce /home/andreas/clean/gcc-head/gcc/tree-ssa-dce.c:1554 0x80c0e12f tree_ssa_cd_dce /home/andreas/clean/gcc-head/gcc/tree-ssa-dce.c:1637 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See http://gcc.gnu.org/bugs.html for instructions.
